918540 has 108 divisors (see below), whose sum is σ = 3306576. Its totient is φ = 209952.

The previous prime is 918539. The next prime is 918563. The reversal of 918540 is 45819.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 131217 + ... + 131223.

2⁹¹⁸⁵⁴⁰ is an apocalyptic number.

918540 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 918540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1653288).

918540 is an abundant number, since it is smaller than the sum of its proper divisors (2388036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

918540 is an equidigital number, since it uses as much as digits as its factorization.

918540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 918540 is about 958.4049248621. The cubic root of 918540 is about 97.2074068430.

The spelling of 918540 in words is "nine hundred eighteen thousand, five hundred forty".